Remove unused imports.

Author: goffrie

src/libsyntax/ext/quote.rs

@@ -33,7 +33,7 @@ pub mod rt {
     use ptr::P;
     use std::rc::Rc;
 
-    use ast::{TokenTree, Generics, Expr};
+    use ast::{TokenTree, Expr};
 
     pub use parse::new_parser_from_tts;
     pub use codemap::{BytePos, Span, dummy_spanned, DUMMY_SP};

src/libsyntax/parse/lexer/mod.rs

@@ -18,9 +18,7 @@ use parse::token::{str_to_ident};
 
 use std::borrow::{IntoCow, Cow};
 use std::char;
-use std::fmt;
 use std::mem::replace;
-use std::num;
 use std::rc::Rc;
 use std::str;